Abstract
15 boys in each of three age groups were tested for ability to reproduce learned linear arm-positioning movements using a slide bar. Movements of 10, 20, and 40 cm were learned without the aid of vision by moving the slide to a stop, then repeated from the same starting position without the stop in place. Analysis of variance yielded a significant main effect of length of movement for both absolute and constant error and also a significant interaction between age and length of movement. The discussion offers explanations based on information-processing capacity and patterns of child development.
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